Overview
Zinc Telluride sputtering targets are critical materials in physical vapor deposition (PVD) processes, particularly for manufacturing semiconductor devices. As a II-VI compound semiconductor, ZnTe offers unique optoelectronic properties that make it valuable for specialized applications. The material is typically produced through high-temperature synthesis and then precision-machined into target forms compatible with sputtering systems. In industrial contexts, ZnTe targets are manufactured with strict purity controls (often 99.99% or higher) to ensure consistent thin-film performance. The targets may be bonded to backing plates for thermal management during the sputtering process. Commercial grades vary by crystallinity (polycrystalline vs. single crystal) and dopant content, allowing customization for specific technical requirements.
Physical and Chemical Properties
Zinc Telluride crystallizes in the zinc blende structure at standard conditions, exhibiting cubic symmetry. Its semiconductor properties include a direct bandgap of approximately 2.26 eV at room temperature, making it particularly suitable for visible and near-infrared applications. The material demonstrates high resistivity in pure form, though it can be doped to achieve p-type conductivity. Thermally, ZnTe maintains stability up to its melting point of 1,235°C, with a thermal expansion coefficient of 8.3×10⁻⁶/K. Chemically, it is stable in dry air but may oxidize at elevated temperatures. The material's hardness (about 120 Knoop) and brittleness require careful handling during target fabrication and installation in sputtering systems.
Main Applications
The primary use of ZnTe sputtering targets lies in depositing thin films for optoelectronic devices. In photovoltaic applications, ZnTe serves as a back contact material for cadmium telluride (CdTe) solar cells, where its band alignment facilitates efficient charge collection. The material is also employed in electro-optic modulators for telecommunications due to its nonlinear optical properties. Emerging applications include radiation detectors, where ZnTe's high atomic number components enable efficient X-ray and gamma-ray detection. Research continues into its use in blue-green LEDs and as a substrate for epitaxial growth of other II-VI compounds. The targets may also be used in academic research for fundamental studies of semiconductor interfaces and heterostructures.
Safety and Storage
ZnTe targets require careful handling due to the toxicity of tellurium compounds. Dust generation during machining or breakage poses inhalation risks, necessitating NIOSH-approved respirators in powder-handling situations. The material should be stored in sealed containers under dry, inert atmospheres to prevent oxidation or moisture absorption. In case of fire, use dry chemical extinguishers - water may react with hot material. Spills should be contained and cleaned by professionals with appropriate protective equipment. Disposal must comply with local regulations for heavy metal-containing substances. For bonded targets, additional precautions apply based on the bonding material (typically indium or silver-based alloys).
B2B Procurement Guide
Industrial buyers should specify target dimensions (diameter/thickness for discs, L×W×T for rectangular), purity grade (standard 4N or high-purity 5N-6N), and crystallinity requirements. Bonded targets require details about backing plate material (usually copper or molybdenum) and bonding method. Surface finish (typically <1μm roughness) and density (>95% theoretical) are critical quality indicators. Lead times for custom targets often range 4-8 weeks. Consider requesting certification documents including chemical analysis reports, ultrasonic inspection results for bonded targets, and material safety data sheets. For high-volume procurement, evaluate multiple qualified suppliers in China, Japan, and Germany - the main production regions for II-VI compound targets.
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